PSS Shaft Seal 2" Shaft 3-1/4" TubeShaft Diameter: 2"
Stern Tube Diameter (D): 3-1/4" to 3-3/8"
Total Length (A): 9.175"
Total Length (compressed) (Compressed A): 8.175"
Rotor Diameter (B): 3.75"
Carbon Cuff Diameter (C): 3.25"
Stern Cuff Length (E): 2"
The PSS Shaft Seal is the number one selling marine mechanical seal
worldwide and is installed as standard equipment by many of the worlds most
reputable boat builders / yards. The PSS Shaft Seal is also recognized as
the premiere retrofit (aftermarket) seal on the world market. Certified by
Bureau Veritas, ABS & Rina: Boat builders / yards recognize the advantages
and value of installing the PSS as it eliminates the maintenance, constant
adjustment & cost associated with traditional packing type glands. Aside
from these benefits, the PSS Shaft Seal helps to eliminate water in the
bilge (100% water tight) & wear to the propeller shaft. The PSS Shaft Seal
can be easily retrofitted and is available for shafts ranging from 3/4"
(20mm) to 6" (150mm).
The PSS Shaft Seal is a mechanical face seal that is created between
the flat surfaces of the rotating stainless steel rotor and the stationary
carbon flange. The stationary carbon flange is attached to the vessels stern tube with hose clamps and the carbon flange is attached to the front side of the bellows with hose clamps. The stainless steel rotor is fit on the shaft
in front of the carbon flange. The stainless steel rotor is used to compress the bellows before the collar is secured to the shaft with set-screws. This
compression (pre-load) maintains contact between the faces and allows the
PSS to compensate for the thrust from the propeller. The carbon flange is
bored larger than the shaft diameter allowing it to "float" around the shaft and thus compensate for most misalignment and vibration problems. The
stainless steel collar is sealed to the shaft by two o-rings that are
recessed into the bore of the collar. These o-rings rotate with the shaft
and stainless steel rotor and do not experience wear during operation.
**As with any rubber hose below waterline, the PSS bellows must be inspected on a regular basis for any sign of wear, aging or chemical deterioration.
PYI suggests as preventative maintenance that the PSS bellow be replaced in
six year intervals. During bellows replacement it is recommended the o-rings & set screws in the stainless steel rotor also be replaced."
Bellows may need to be more frequently inspected in an environment where
non-sealed batteries emit sulfuric acid. Sulfuric acid vapor will accelerate rubber deterioration, as will an ozonater.
The Maintenance Kit includes the items you need to properly maintain your
PSS Shaft Seal. Included in the kit is one (1) PSS bellow, two (2) O-rings,
five (5) set screws, four (4) new hose clamps and an allen key.
The PSS Shaft Seal is the leading marine mechanical seal used worldwide, designed for shafts up to 6 inches in diameter. Installed as standard equipment in many reputable boat builders and yards, this seal offers a reliable, maintenance-free solution that eliminates water intrusion and reduces wear on the propeller shaft. Its robust design ensures a watertight seal, helping to prevent bilge flooding and prolonging the lifespan of your shaft components. The PSS Shaft Seal is an excellent retrofit option, certified by Bureau Veritas, ABS, and RINA, and is compatible with shafts ranging from 3/4 inch to 6 inches in diameter. Its ease of installation and proven performance make it a preferred choice for both new builds and upgrades in the marine industry.
Constructed as a mechanical face seal, the PSS Shaft Seal creates a tight seal between the stainless steel rotor and the stationary carbon flange. The carbon flange attaches to the stern tube with hose clamps, while the rotor is mounted on the shaft in front of the flange. The design features a compression mechanism that maintains contact between the faces, compensates for propeller thrust, and adapts to misalignment and vibration due to the floating carbon flange. The stainless steel collar, sealed with durable o-rings, ensures a secure fit on the shaft, with the rotating o-rings preventing wear during operation. Regular inspection of the rubber bellows is recommended, especially in environments with chemicals such as sulfuric acid vapor or ozone, which can accelerate deterioration.
To simplify maintenance, the PSS Shaft Seal includes a comprehensive maintenance kit with replacement bellows, o-rings, set screws, hose clamps, and an Allen key. Proper upkeep involves replacing the bellows every six years or sooner in harsh environments, along with inspecting the o-rings and set screws. This proactive approach helps maintain the seal’s integrity and prolongs its service life, ensuring continuous protection against water intrusion and shaft wear. The design’s versatility and reliability make the PSS Shaft Seal an essential component for marine applications, providing peace of mind and optimal performance for your vessel.
Features:
- Shaft Diameter: 2 inches for a secure fit
- Stern Tube Compatibility: 3-1/4 inch to 3-3/8 inch diameter
- Total Length: 9.175 inches with a compressed length of 8.175 inches
- Rotor Diameter: 3.75 inches for effective sealing
- Carbon Cuff Diameter: 3.25 inches for optimal contact
- Easy Retrofit: Suitable for shafts from 3/4 inch to 6 inches
- Certified Performance: Approved by Bureau Veritas, ABS, and RINA
- Maintenance Kit Included: Bellows, o-rings, set screws, hose clamps, and Allen key
- Reliable Seal: Creates a water-tight barrier to prevent bilge water ingress
- Durable Design: Compatible with harsh marine environments and chemical exposure
